public function preExecute()
{
  $this->checkBasicAuth();
}

	
protected function sendHeadersAndExit ()
{
  header('WWW-Authenticate: Basic realm="Acces restreint"');
  header('HTTP/1.0 401 Unauthorized');
  header('Content-Type: text/html; charset=utf-8');
  exit();
}

protected function checkBasicAuth()
{
  if($this->getUser()->isAuthenticated() && $this->getUser()->hasAttribute('user_id')) return true;

  if (!isset($_SERVER['PHP_AUTH_USER']))
    {
      $this->sendHeadersAndExit();
    }

  $group = ParameterPeer::get('contributeur_groupe_id');

  if ( !$member = MemberPeer::authCheckTrickSpace($_SERVER['PHP_AUTH_USER'], $_SERVER['PHP_AUTH_PW'], $group) )
    {
      $this->sendHeadersAndExit();
    }
  else
    {
      $this->getUser()->setAttribute('member_id', $member->getId());
      $this->getUser()->setAuthenticated(true);
    }
}

Symfony HTTP AUTH

PHP